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County Codes
Chapman County Codes are largely a superset of the ISO 3166-2:GB and BS 6879 codes identifying administrative divisions in the United Kingdom, Ireland, the Isle of Man and the Channel Islands, but covering historical divisions. They were created by Dr Colin Chapman, and are widely used in genealogy.
They have no postal reference and are not used by the Royal Mail.
They include codes for before the reorganisations of counties that took place in 1974 in England and Wales, and in 1975 in Scotland, but ignore the break-up into smaller local unitary authorities in 1996. The codes for counties created after the reorganisations are denoted with an asterisk (*).
After the division of Ireland (IRL) in 1922, counties within Northern Ireland are ascribed NIR.

Country Codes
England ENG Scotland SCT Wales WLS N.Ireland NIR Ireland IRL Channel Isles CHI

In Code Order
ABD Aberdeenshire SCT
AGY Anglesey WAL
ALD Alderney CHI
ANS Angus (formerly Forfarshire) SCT
ANT Co. Antrim NIR
ARL Argyllshire SCT
ARM Co. Armagh NIR
AVN Avon * ENG
AYR Ayrshire SCT
BAN Banffshire SCT
BDF Bedfordshire ENG
BEW Berwickshire SCT
BKM Buckinghamshire ENG
BOR Borders * SCT
BRE Breconshire WAL
BRK Berkshire ENG
BUT Bute (Buteshire) SCT
CAE Caernarvonshire WAL
CAI Caithness SCT
CAM Cambridgeshire ENG
CAR Co. Carlow IRL
CAV Co. Cavan IRL
CEN Central * SCT
CGN Cardiganshire WAL
CHI Channel Islands (Sometimes just "CI") ENG
CHS Cheshire ENG
CLA Co. Clare IRL
CLK Clackmannanshire SCT
CLV Cleveland * ENG
CMA Cumbria * ENG
CNM Carmarthenshire WAL
CON Cornwall ENG
COR Co. Cork IRL
CUL Cumberland ENG
CWD Clwyd * WAL
DBY Derbyshire ENG
DEN Denbighshire WAL
DFD Dyfed * WAL
DFS Dumfries-shire SCT
DGY Dumfries and Galloway SCT
DNB Dunbartonshire SCT
DON Co. Donegal IRL
DOR Dorset ENG
DOW Co. Down NIR
DUB Co. Dublin IRL
DUR Co. Durham ENG
ELN East Lothian (formerly Haddingtonshire) SCT
ENG England ENG
ERY Yorkshire - East Riding ENG
FER Co. Fermanagh NIR
FLN Flintshire WAL
GAL Co. Galway IRL
GLA Glamorgan WAL
GLS Gloucestershire ENG
GMP Grampian * SCT
GNT Gwent * WAL
GSY Guernsey CHI
GTM Greater Manchester * ENG
GWN Gwynedd * WAL
HAM Hampshire ENG
HEF Herefordshire ENG
HLD Highland * SCT
HRT Hertfordshire ENG
HUM Humberside * ENG
HUN Huntingdonshire ENG
HWR Hereford and Worcester * ENG
INV Inverness-shire SCT
IOM Isle of Man ENG
IOW Isle of Wight - part of Hampshire (HAM) ENG
IRL Ireland IRL
JSY Jersey CHI
KCD Kincardineshire (Mearns) SCT
KER Co. Kerry IRL
KID Co. Kildare IRL
KIK Co. Kilkenny IRL
KKD Kirkcudbrightshire SCT
KRS Kinross-shire SCT
LAN Lancashire ENG
LDY Co. Londonderry NIR
LEI Leicestershire ENG
LET Co. Leitrim IRL
LEX Co. Laois IRL
LIM Co. Limerick IRL
LIN Lincolnshire ENG
LKS Lanarkshire SCT
LND London ENG
LOG Co. Longford IRL
LOU Co. Louth IRL
LTN Lothian SCT
MAY Co. Mayo IRL
MDX Middlesex ENG
MEA Co. Meath IRL
MER Merionethshire WAL
MGM Mid Glamorgan * WAL
MGY Montgomeryshire WAL
MLN Midlothian (formerly Edinburghshire) SCT
MOG Co. Monaghan IRL
MON Monmouthshire WAL
MOR Morayshire (formerly Elginshire) SCT
MSY Merseyside * ENG
NBL Northumberland ENG
NFK Norfolk ENG
NIR Northern Ireland IRL
NRY Yorkshire - North Riding ENG
NTH Northamptonshire ENG
NTT Nottinghamshire ENG
NYK North Yorkshire * ENG
OFF Co. Offaly IRL
OKI Orkney Isles SCT
OXF Oxfordshire ENG
PEE Peebles-shire SCT
PEM Pembrokeshire WAL
POW Powys * WAL
RAD Radnorshire WAL
RFW Renfrewshire SCT
ROC Ross and Cromarty SCT
ROS Co. Roscommon IRL
ROX Roxburghshire SCT
RUT Rutland ENG
SAL Shropshire ENG
SCT Scotland SCT
SEL Selkirkshire SCT
SFK Suffolk ENG
SGM South Glamorgan * WAL
SHI Shetland Isles SCT
SLI Co. Sligo IRL
SOM Somerset ENG
SRY Surrey ENG
SSX Sussex ENG
STD Strathclyde * SCT
STI Stirlingshire SCT
STS Staffordshire ENG
SUT Sutherland SCT
SXE East Sussex * ENG
SXW West Sussex * ENG
SYK South Yorkshire * ENG
TAY Tayside * SCT
TIP Co. Tipperary IRL
TWR Tyne and Wear * ENG
TYR Co. Tyrone NIR
WAR Warwickshire ENG
WAT Co. Waterford IRL
WEM Co. Westmeath IRL
WES Westmorland ENG
WEX Co. Wexford IRL
WGM West Glamorgan * WAL
WIC Co. Wicklow IRL
WIG Wigtownshire SCT
WIL Wiltshire ENG
WIS Western Isles SCT
WLN West Lothian (formerly Linlithgowshire) SCT
WMD West Midlands * ENG
WOR Worcestershire ENG
WRY Yorkshire - West Riding ENG
WYK West Yorkshire * ENG
YKS Yorkshire ENG

In County Order
Aberdeenshire ABD
Alderney ALD
Anglesey AGY
Angus (formerly Forfarshire) ANS
Argyllshire ARL
Arran (see Bute) BUT
Avon * AVN
Ayrshire AYR
Banffshire BAN
Bedfordshire BDF
Berkshire BRK
Berwickshire BEW
Borders * BOR
Breconshire BRE
Buckinghamshire BKM
Bute (Buteshire) BUT
Caernarvonshire CAE
Caithness CAI
Cambridgeshire CAM
Cardiganshire CGN
Carmarthenshire CNM
Central * CEN
Channel Islands (Sometimes just "CI") CHI
Cheshire CHS
Clackmannanshire CLK
Cleveland * CLV
Clwyd * CWD
Co. Antrim ANT
Co. Armagh ARM
Co. Carlow CAR
Co. Cavan CAV
Co. Clare CLA
Co. Cork COR
Co. Derry (see Londonderry) LDY
Co. Donegal DON
Co. Down DOW
Co. Dublin DUB
Co. Durham DUR
Co. Fermanagh FER
Co. Galway GAL
Co. Kerry KER
Co. Kildare KID
Co. Kilkenny KIK
Co. Kings (see Offaly) OFF
Co. Laois (see Leix(Queens)) LEX
Co. Leitrim LET
Co. Leix (Laois(Queens)) LEX
Co. Limerick LIM
Co. Londonderry LDY
Co. Longford LOG
Co. Louth LOU
Co. Mayo MAY
Co. Meath MEA
Co. Monaghan MOG
Co. Offaly (Kings) OFF
Co. Queens (see Leix) LEX
Co. Roscommon ROS
Co. Sligo SLI
Co. Tipperary TIP
Co. Tyrone TYR
Co. Waterford WAT
Co. Westmeath WEM
Co. Wexford WEX
Co. Wicklow WIC
Cornwall CON
Cumberland CUL
Cumbria * CMA
Denbighshire DEN
Derbyshire DBY
Devon DEV
Dorset DOR
Dumfries and Galloway DGY
Dumfries-shire DFS
Dunbartonshire DNB
Durham DUR
Dyfed * DFD
East Lothian (formerly Haddingtonshire) ELN
East Riding of Yorkshire ERY
East Sussex * SXE
Edinburgh (see Midlothian) MLN
Elgin (see Moray) MOR
England ENG
Essex ESS
Fife FIF
Flintshire FLN
Forfar (see Angus) ANS
Glamorgan GLA
Gloucestershire GLS
Grampian * GMP
Greater Manchester * GTM
Guernsey GSY
Gwent * GNT
Gwynedd * GWN
Haddington (see East Lothian) ELN
Hampshire HAM
Hereford and Worcester * HWR
Herefordshire HEF
Hertfordshire HRT
Highland * HLD
Humberside * HUM
Huntingdonshire HUN
Inverness-shire INV
Ireland IRL
Islay (see Argyll) ARL
Isle of Man IOM
Isle of Wight - part of Hampshire (HAM) IOW
Jersey JSY
Jura (see Argyll) ARL
Kent KEN
Kincardineshire (Mearns) KCD
Kinross-shire KRS
Kirkcudbrightshire KKD
Lanarkshire LKS
Lancashire LAN
Leicestershire LEI
Lewis - part (see Inverness-shire) INV
Lewis - part (see Ross & Cromarty) ROC
Lincolnshire LIN
Linlithgow (see West Lothian) WLN
London LND
Lothian LTN
Mearns (see Kincardineshire) KCD
Merionethshire MER
Merseyside * MSY
Mid Glamorgan * MGM
Middlesex MDX
Midlothian (formerly Edinburghshire) MLN
Monmouthshire MON
Montgomeryshire MGY
Morayshire (formerly Elginshire) MOR
Mull (see Argyll) ARL
Nairn NAI
Norfolk NFK
North Riding of Yorkshire NRY
North Uist (see Inverness-shire) INV
North Yorkshire * NYK
Northamptonshire NTH
Northern Ireland NIR
Northumberland NBL
Nottinghamshire NTT
Orkney Isles OKI
Oxfordshire OXF
Peebles-shire PEE
Pembrokeshire PEM
Perth PER
Powys * POW
Radnorshire RAD
Renfrewshire RFW
Ross and Cromarty ROC
Roxburghshire ROX
Rutland RUT
Sark SRK
Scilly Isles - part of Cornwall CON
Scotland SCT
Selkirkshire SEL
Shetland Isles SHI
Shropshire SAL
Skye (see Inverness-shire) INV
Somerset SOM
South Glamorgan * SGM
South Uist (see Inverness-shire) INV
South Yorkshire * SYK
Staffordshire STS
Stirlingshire STI
Strathclyde * STD
Suffolk SFK
Surrey SRY
Sussex SSX
Sutherland SUT
Tayside * TAY
Tyne and Wear * TWR
Wales WAL
Warwickshire WAR
West Glamorgan * WGM
West Galloway (see Wigtownshire) WIG
West Lothian (formerly Linlithgowshire) WLN
West Midlands * WMD
West Riding of Yorkshire WRY
West Sussex * SXW
West Yorkshire * WYK
Western Isles WIS
Westmorland WES
Wigtownshire (West Galloway) WIG
Wiltshire WIL
Worcestershire WOR
Yorkshire YKS
Yorkshire - East Riding ERY
Yorkshire - North Riding NRY
Yorkshire - West Riding WRY
Zetland (see Shetland Isles) SHI

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